Spark-plug tester.



JOSEPH VALOIS, ALPHONSE GROISE 6; ARMAND GROISE.

, SPARK PLUG TESTER.

APPLIGATION FILED P312. 9, 1912.

1,033,498. Patented July 23, 1912.

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I a ATTORNEY.

moved from nher c air.

' for establishing a compression of air in llNlTED STATES P 31'. l? FEES GROISE, AND AMEND GEQISE, MASSACHUSET'Ei JGSEPH VALOIS ALPHONSE E HQLYOKE,

erase-race 'rns'rnn Specification or Letters Patent.

LilliiiASS. Patented sui eaiere'.

Application filed February 9, 191?}. Serial No. 6%,528.

To all whomit may concern:

Be it, known that We, Josnrn VALois, a British subject, and Anrnonse Gnoisnand Ann-inc GI'.0lSE, F1IlCli subjects, and resi dents of Holyoke, in the county of Hampden and State of Massachusetts, have invented certain new and useful improvements in Spark-Plug Testers, of which the following is a full, clear, and exactdescription.

This invention relates to a device primarily designed as an implement to be carried in the tool kit of an automobile for testing spark plugs preparatory to screwing them with the accompanying whichzc Figure l is a side elevation of the spark plug testing device; Fig. 2 is a central verti cal sectional view through the same, the air compressing pump of common form being represented in side elevation. Fig. 3 is a horizontal cross sectional 8-3, Fig. 2. Figsi and are sectional views of the lower portion of the device showing the same adapted for the reception therein of interchangeable bushings for dit ferent standard kinds of spark plugs.

Similar characters of reference indicate drawings in view on line i t place i th li d corresponding parts in all. ofthe views.

The ordinary manner of' testing a spark in the drawings, A represents the holler plug is'to attach the spark circuit wire or" an body of the device constructed to provide the inclos ed air chamber a therein. This body is made with upper and lower metallic heads I) and (1 having sockets e therein; and B represents a skele tonized metallic tube formed with Windowlike openings f at its side or opposite sides and having its circular end'portions externally screw threaded for engagements in aforementioned sockets e of? the heads 3 and d. And the heads-united and held together by the said skeletonized tube E also confine between them theglass tube D of comparatively large diameter, suitable peels ing being provided between the ends of the glass tube and the bases of thesockets e.

The frame or body of the device hastrans- .versely extending bracket lugs g g which support the cylinder 72 oi a hand nir- -compressing pump, the same being, connected by clips a or in any practical manner.

k re )lBSQIliS the movable operating member of the pump and to which the pump pistonis attached. The pump has at its lower end through the passage y' into the chamber agand the. degree of the air pressure established iii the air chamber may be determined by the pressure gage G which is connected at the top of the body of the device.

S represents a spark plu screwed into the threaded aperture min the lower head d, and 0 represents the spark circuit wire connected with the spark plug.

In the employmentof the device, the plug being inserted in its place as shown, and the wire 0 connected, the pump is operated by hand to establish a pressure say from to 75 pounds in the chamber 11, approximately automobile to the plug when the same is rethe cylinder, and in the atmosunder conditions for the sending of the current through the plug observing Whether or not the same sparks. This is not always an efiectual test, as a spark plug which may emit a spark While in the atmospheric air will not be effective as. a spark producer when tightly in place in its connection with the cylinder and subjected to the compression of the gas aspertormed in the actual and practical usage of the same.

This invention, therefore, is to provide a means by which the spark plug, at the time the current is sent through it, is subjected to the same conditions of fluid compression as when actually in use in the cylinder of an engine, the same being so made with a window or transparent portion inits wall that it may be discerned hether or not under the establishment of the current the plug is sparking.

The invention contemplates the provision of an inclosed chamber having a transpar out well and provided in afportion of its inclosing wall,"wliicli is pre erably of metal,- with an aperture adapted to receive connectiontherein of the shank of a spark plug, and means such as an air compressing pump i the inclosed chamber approximately the same as that established in the cylinder of the gasolene engine; and the device, moreover, is equipped with a gage for determining the amount of the pressure of the air established within the chamber to which the spark plug is subjected.

The device is described in conjunction circularly threaded the connection corresponding to the gas compression in the engine cylinder, and then the metallic body of the tester may be laid upon or brought to contact with the engine body so that the conductivity of the current may be completed; and then by looking through the transparent orwindow-like part of the body it may be perceived whether or not there is a sparking of the plug.

In order to adoptthe apparatus for the .Icstin of s )urk lin s of different standards we provide interchangeable annular bushings Z for screw threading engagements in the lower head (Z, as represented in Figs. t and 5. And the tool or apparatus is coinn'lercially to be sold with a set of these inter- ClltlIlgQtlblB bushings for the manifest c01npletion of the equipment.

In a spark plug tester, upper and lower metallic heads having threaded sockets therein, a tubular member formed with apertures therein endwise screw engaged in the sockets of the heads, a glass tube within the tuhl'llur apertured member and cxtendingtronl one to the other of the bzuxcs of said sockets in the opposite heuds,--sz.zid heads having laterally extending bracket lugs, and on air compressing pump supported by said bracket lugs and having connection with the passage through one of said members which leads into the glass tube inclosing chamber, and one of said members having an aperture Itnl receiving connection therein of the shank of a spark plug.

Signed by us at- Springlield, Mass, in presence of two subscribing witnesses.

JUSEPH V ALOlS. i-UJIHUNSE GRUISE, Althilr'tND t-lItQl 5E.

llitncsses Wu. S. Bnnnows, G. R. DiusooLL. 

